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Effect of density on larval development and female productivity ofTisbe holothuriae (Copepoda, Harpacticoida) under laboratory conditions
Helgoländer Meeresuntersuchungen volume 47, pages 229–241 (1993)
Abstract
The harpacticoid copepodTisbe holothuriae has been cultivated in the Helgoland laboratory for more than 20 years. The effects of density on the larval development and the female productivity were studied by comparing two culture systems: (1) enclosed system, and (2) running-water system. In both systems, a nutritious mixed diet ofDunaliella tertiolecta, Skeletonema costatum, and granulatedMytilus edulis was offered. Larval mortality, larval development and female productivity are found to be significantly dependent on both the population density and specificity of the culture system. Increasing density causes higher larval mortality, longer larval development time, and a reduction in female productivity. In comparison with the enclosed system, the running-water system shows decisive advantages: larval mortality is about 20% lower, the rate of larval development is about two days shorter, and there is a very high rate of nauplii production. The sex ratio exhibits high variations, but in general, there is no clear relationship between sex ratio and population density. Nevertheless, when reared in the running-water system, a relatively high percentage of females (>45%) was found at lower densities.
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Zhang, Q., Uhlig, G. Effect of density on larval development and female productivity ofTisbe holothuriae (Copepoda, Harpacticoida) under laboratory conditions. Helgolander Meeresunters 47, 229–241 (1993). https://doi.org/10.1007/BF02430361
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DOI: https://doi.org/10.1007/BF02430361